Surface Plate
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A surface plate is a precision plate for measuring, layup, and precision tool making.
https://en.wikipedia.org/wiki/Surface_plate#Accuracy_and_grade
Grades - AA is under 5/100 of a thousandth accuracy per foot. Tool room grade B is 0.0002 (5 micron).
Sourcing
- Quite affordable for the precision. $116 for grade A, 24x18x3 - [1]